LG CU400 Hinge Replacement

简介

This guide will show you how to remove and replace the hinge of the LG CU400. The hinge holds the phone together and is responsible for the spring action of the flip phone. This repair would need to happen if the phone would not close or is in two pieces.

你所需要的

步骤 1 Battery

LG CU400 Hinge Replacement, Battery: 步骤 1 中的图像 1，2

LG CU400 Hinge Replacement, Battery: 步骤 1 中的图像 2，2

Push the button labeled 'PUSH' on the rear cover.

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步骤 2

LG CU400 Hinge Replacement: 步骤 2 中的图像 3，3

Slide the rear cover towards you.

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步骤 3

To remove the battery, grasp the top front edge of the battery and pull the battery away from the phone.
When installing the new battery, have the metal contacts of the phone match up with the metal contacts of the battery.

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步骤 4 Bottom Half Assembly

LG CU400 Hinge Replacement, Bottom Half Assembly: 步骤 4 中的图像 1，2

LG CU400 Hinge Replacement, Bottom Half Assembly: 步骤 4 中的图像 2，2

Remove the sim card by sliding the card out from under the retainer using either your fingers or a spudger.

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步骤 5

Remove the rubber covers in the highlighted locations using a metal spudger.

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步骤 6

Remove the six 3mm #000 flat Phillips head screws from the back of the phone using a Phillips #000 Screwdriver.

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步骤 7

Remove the headphone jack cover with your finger or metal spudger.

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步骤 8

LG CU400 Hinge Replacement: 步骤 8 中的图像 3，3

Insert the metal spudger between the keypad assembly and back cover assembly and pry the two assemblies apart.
Pry gently as to not break the plastic clips that hold the two assemblies together.
Work your way around the perimeter of the phone with the metal spudger to separate the two assemblies.

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步骤 9

Once you have worked your way around the perimeter of the phone, you will have access to the components in the bottom half assembly.

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步骤 10 Motherboard

LG CU400 Hinge Replacement, Motherboard: 步骤 10 中的图像 1，3

LG CU400 Hinge Replacement, Motherboard: 步骤 10 中的图像 2，3

LG CU400 Hinge Replacement, Motherboard: 步骤 10 中的图像 3，3

You should notice that the number pad is loose and can simply be taken out of the open phone casing.

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步骤 11

Using the spudger, start to gently pry the motherboard from the back of the phone and work your way around the perimeter of the motherboard.
There are copper ribbon cables connected to each side of the motherboard leading to the buttons for volume control and the camera that need slid out of the phone casing as the motherboard is being removed.
There are three in total, but do not remove the top one from the phone casing yet.

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步骤 12

Once the motherboard is not locked in place it will still be attached to the back phone casing by two wires, red and black, twisted together.
Use tweezers to grab the black piece that these wires are attached to and simply pull it off the motherboard.
You may need to flip the phone over so that the screen is facing down. Feel free to move the keypad assembly to the closed position for this step.

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步骤 13

Remove the display ribbon cable from the back of the motherboard using tweezers.
Make sure to lift it so that you are pulling the entire thing off at once and not pulling off the flat piece at an angle.

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步骤 14

Use tweezers to remove the top ribbon cable, mentioned in step 11, from the hinge area.

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步骤 15

LG CU400 Hinge Replacement: 步骤 15 中的图像 3，3

Grasp either side of the motherboard and gently lift it away from the phone casing.
The motherboard should be completely free of the phone casing, and you should have what is shown in the pictures.

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步骤 16 Top Half Assembly

LG CU400 Hinge Replacement, Top Half Assembly: 步骤 16 中的图像 1，1

Remove the four rubber covers from the front screen using a metal spudger.

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步骤 17

Remove the four 3mm #000 flat Phillips head screws from the front screen using a Phillips #000 Screwdriver.

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步骤 18

LG CU400 Hinge Replacement: 步骤 18 中的图像 3，3

Insert the metal spudger in the seam on the top assembly. This will pry the two pieces apart from each other.
Continue to work around the perimeter of the phone with the metal spudger.
Once you have worked around the perimeter of the phone you should have two halves to the top assembly, the screen assembly and the cover.

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步骤 19

LG CU400 Hinge Replacement: 步骤 19 中的图像 3，3

Set aside the cover half.
Using tweezers, carefully disconnect the display ribbon cable from the screen assembly and phone by lifting up on both connections.
The display ribbon cable will still be attached to the phone via the hinge. The disconnection of the display ribbon cable in this step is to remove the screen from the screen assembly.